阅读说明：本技术 一种检测水位的方法及应用该方法的装置 (Method for detecting water level and device applying same ) 是由 刘群 潘叶江 于 2021-09-23 设计创作，主要内容包括：本发明涉及水位检测技术领域,具体涉及一种检测水位的方法,包括步骤：S1：实时检测水箱水位,若出现缺水状态进入下一步；S2：实时监测并比较蒸发器温度Temp与设定温度Targ,若蒸发器温度Temp大于设定温度Targ时进入下一步；S3：继续实时监测并比较水泵工作指定时间后蒸发器温度Temp与设定温度Targ关系,若蒸发器温度Temp下降,重复上述步骤S2,若蒸发器温度Temp未下降,则报警水箱无水,水箱加水后重复步骤S1。本发明具有水位的初步粗略检测和与初步粗略检测无缝衔接配合的小水量状态下的精准水位检测,实现高精度检测；在水位检测的各个环节配合设置水路异常检测功能,能准确的提醒水箱是否缺水以及水路异常,保证装置的长期安全使用。(The invention relates to the technical field of water level detection, in particular to a method for detecting water level, which comprises the following steps: s1: detecting the water level of the water tank in real time, and entering the next step if a water shortage state occurs; s2: monitoring and comparing the evaporator temperature Temp with the set temperature Targ in real time, and entering the next step if the evaporator temperature Temp is greater than the set temperature Targ; s3: and continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a designated time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, alarming that the water tank is not filled with water if the evaporator temperature Temp is not reduced, and repeating the step S1 after the water tank is filled with water. The invention has the advantages that the initial rough detection of the water level and the accurate water level detection in the small water amount state in seamless connection and matching with the initial rough detection are realized, and the high-precision detection is realized; each link of water level detection cooperates and sets up the unusual detection function in water route, and whether the warning water tank that can be accurate lacks water and the water route is unusual, guarantees the long-term safe handling of device.)

1. A method of detecting water level, comprising: the method comprises the following steps:

s1: detecting the water level of the water tank in real time, and entering the next step if a water shortage state occurs;

s2: monitoring and comparing the evaporator temperature Temp with the set temperature Targ in real time, and entering the next step if the evaporator temperature Temp is greater than the set temperature Targ;

s3: and continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a designated time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, alarming that the water tank is not filled with water if the evaporator temperature Temp is not reduced, and repeating the step S1 after the water tank is filled with water.

2. A method of detecting water level according to claim 1, wherein: the method for judging the drop of the evaporator temperature Temp in S3 is as follows:

the set temperature difference is: tx;

judging whether the evaporator temperature meets Temp < ═ (Targ-Tx);

if yes, the step S2 is repeated, if not, the alarm water tank is free of water, and the step S1 is repeated after the user adds water.

3. The method for detecting water level according to claim 2, wherein the step S1 further comprises a method for monitoring abnormal water path, comprising the steps of:

judging whether Temp > (Targ-Tx) is met or not when the water shortage state does not appear in S1;

if yes, alarming that the water path is abnormal;

if not, the waterway is in a normal state, and the next step is carried out.

4. The method of detecting a water level according to claim 3, wherein: and in the step S3, after the water pump works for a certain time and waits for a time Td, the relation between the evaporator temperature Temp and the set temperature Targ is compared.

5. The method for detecting a water level according to any one of claims 1 to 4, wherein: when the water tank is detected to be lack of water in S1, the residual water amount in the water tank is V1, the water flow of the water pump per second is Q, the time T1 for the water pump to dry the water tank is V1/Q, and the working time T, T < < T1 of the water pump is started in S3.

6. The method for detecting water level according to claim 5, wherein: and the number of times of starting the water pump is N, whether the water pump meets the condition V1 (N t Q) or not is judged, and if yes, the alarm water tank is free of water.

7. The method for detecting water level according to claim 5, wherein: the water flow of the water pump per second is Q, and the method comprises a numerical value real-time adjusting method:

starting to record when the first alarm water tank is empty, wherein the alarm frequency is nth;

from the first no-water alarm time Q1-V1/(N t), until the nth no-water alarm time Qn-V1/(N t);

recording the values of Q1-Qn;

and taking the average value of Q1-Qn as the water flow rate Q per second used in calculation in the current detection step.

8. The method for detecting water level according to claim 7, wherein: and the Q1-Qn are sorted according to the numerical value, and the average value is taken as the water flow rate Q per second used in the calculation in the current detection step after the maximum value and the minimum value are removed.

9. The method for detecting water level according to claim 4, wherein: the waiting time Td is gradually decreased along with the increase of the times N of starting the water pump.

10. A method of detecting water level according to claim 1, wherein: and in the step S1, the real-time detection of the water level of the water tank is performed through a reed pipe liquid level meter.

11. A method of detecting water level according to claim 10, wherein: the method for detecting the water tank by the reed pipe liquid level meter comprises the following steps: when the water is full, the reed switch is disconnected, and when the water is short, the reed switch is closed.

12. An apparatus for detecting water level, comprising: the water level detection device adopts the water level detection method of any one of claims 1 to 11 to detect the water level of the water tank, the water level detection device comprises the water tank, a reed pipe liquid level meter is arranged in the water tank, the water tank is connected with a water inlet of a water pump through a water inlet pipe, a water outlet of the water pump is connected with an evaporator through a water outlet pipe, a heating pipe and a temperature sensor are arranged in the evaporator, a steam outlet of the evaporator is connected with a steaming and baking cavity through a steam output pipe, and the water pump, the evaporator, the reed pipe liquid level meter, the heating pipe and the temperature sensor are all connected with an MCU.

Technical Field

The invention relates to the technical field of water level detection, in particular to a method for detecting water level and a device applying the method.

Background

There are many devices that need to detect water level during operation, for example: generally, a floater is used for detecting water level, the main principle is a reed pipe principle, only water is detected or not detected, at least one third of water is clearly stored in a water tank when the water tank is used in a product, but the product reports that the water tank is lack of water. If the product water route is abnormal, misjudgment can also occur, so that the user experience is poor due to a light person, and the product false alarm warning is not working due to a heavy person.

Therefore, traditional water level detection detects the water level through the tongue tube, and when detecting water full, the tongue tube disconnection, the master control detects MCU's level and is the high level, otherwise when detecting not water, reminds the user to add water when not water, and the water tank in fact probably because tongue tube detects the reason, has a lot of water in the water tank in addition, if the product water route appears unusually, also can appear the erroneous judgement.

Disclosure of Invention

The invention aims to provide a method for detecting water level, which solves the defects that the prior art can not accurately calculate the water level, is easy to generate false alarm, can not judge whether a water channel is abnormal or not and the like.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a method of detecting a water level, comprising the steps of:

s1: detecting the water level of the water tank in real time, and entering the next step if a water shortage state occurs;

s2: monitoring and comparing the evaporator temperature Temp with the set temperature Targ in real time, and entering the next step if the evaporator temperature Temp is greater than the set temperature Targ;

s3: and continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a designated time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, alarming that the water tank is not filled with water if the evaporator temperature Temp is not reduced, and repeating the step S1 after the water tank is filled with water.

Further, the step of detecting the water level of the water tank in real time in the step S1 is to detect the water level through a reed pipe liquid level meter.

Further, the method for detecting the water tank by the reed switch liquid level meter comprises the following steps: when the water is full, the reed switch is disconnected, and when the water is short, the reed switch is closed.

Further, the method for determining the drop in the evaporator temperature Temp in S3 is as follows:

the set temperature difference is: tx;

judging whether the evaporator temperature meets Temp < ═ (Targ-Tx);

if yes, the step S2 is repeated, if not, the alarm water tank is free of water, and the step S1 is repeated after the user adds water.

Further, the S1 method further includes a method for monitoring abnormal water path, including the steps of:

judging whether Temp > (Targ-Tx) is met or not when the water shortage state does not appear in S1;

if yes, alarming that the water path is abnormal;

if not, the waterway is in a normal state, and the next step is carried out.

Further, the relationship between the evaporator temperature Temp and the set temperature Targ is compared after the water pump operates for a certain time and waits for a time Td in S3.

Furthermore, when the water tank is detected to be lack of water in S1, the remaining water amount in the water tank is V1, the water flow of the water pump per second is Q, the time T1 for the water pump to dry the water tank is V1/Q, and the water pump is started in S3 for the working time T, T < < T1.

Furthermore, the number of times of starting the water pump is N, whether the condition V1 is met or not is judged, and if yes, the alarm water tank is free of water.

Further, the water flow rate of the water pump per second is Q, and the method comprises a real-time numerical value adjusting method:

starting to record when the first alarm water tank is empty, wherein the alarm frequency is nth;

from the first no-water alarm time Q1-V1/(N t), until the nth no-water alarm time Qn-V1/(N t);

recording the values of Q1-Qn;

and taking the average value of Q1-Qn as the water flow rate Q per second used in calculation in the current detection step.

Further, the Q1-Qn are sorted according to the magnitude of the values, and the average value is taken as the water flow rate Q per second used in the calculation in the current detection step after the maximum value and the minimum value are removed.

Further, the waiting time Td decreases with the increase of the number of times the water pump is turned on.

The utility model provides a detect device of water level, the device of detection water level use the water level of detecting the water tank to detect, the device of detection water level include the water tank, be equipped with the tongue tube level gauge in the water tank, the water tank is through the water inlet that advances water piping connection water pump, the delivery port of water pump is through going out water piping connection evaporimeter, be equipped with heating pipe and temperature sensor in the evaporimeter, the steam outlet of evaporimeter passes through steam output tube and connects the chamber of steaming and baking, water pump, evaporimeter, tongue tube level gauge, heating pipe and temperature sensor all link to each other with MCU.

The invention achieves the following beneficial effects:

the system has the advantages that the system has the functions of preliminary rough detection of the water level and accurate water level detection in a small water quantity state in seamless connection and matching with the preliminary rough detection, and high-precision detection is realized; each link of water level detection cooperates and sets up the unusual detection function in water route, and whether the warning water tank that can be accurate lacks water and the water route is unusual, guarantees the long-term safe handling of device.

Drawings

FIG. 1 is a flow chart of a method of detecting water level according to the present invention;

fig. 2 is a schematic structural diagram of an embodiment of the apparatus for detecting a water level.

In the figure, 1, a water tank; 2. a water inlet pipe; 3. a water pump; 4. a water outlet pipe; 5. an evaporator; 6. a steaming and baking cavity; 7. a reed pipe liquid level meter; 8. heating a tube; 9. a temperature sensor; 10. and a steam output pipe.

Detailed Description

To facilitate an understanding of the present invention by those skilled in the art, specific embodiments thereof are described below with reference to the accompanying drawings.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a method for detecting water level, which is applied to the water level detection process of a device needing to detect water level, as shown in figure 2, the device for detecting water level comprises a water tank 1, a water inlet pipe 2, a water pump 3, a water outlet pipe 4, an evaporator 5, a steaming and baking cavity 6, a reed pipe liquid level meter 7, a steam output pipe 10, an MCU and other main components, wherein the reed pipe liquid level meter 7 is arranged in the water tank 1, a heating pipe 8 and a temperature sensor 9 are arranged in the evaporator 5, a water inlet of the water pump is connected with the water tank through a water inlet pipe, a water outlet of the water pump is connected with the evaporator through a water outlet pipe, a steam outlet of the evaporator is connected with the steaming and baking cavity through a steam output pipe, and the water pump 3, the evaporator 5, the reed pipe liquid level meter 7, the heating pipe 8 and the temperature sensor 9 are all connected with the MCU. The device for detecting the water level is exemplified by a steam oven, when the steam oven works, firstly, water is added into a water tank, a water pump pumps the water in the water tank through a water inlet pipe and injects the water into an evaporator through a water outlet pipe, the evaporator works to heat the injected water through a heating pipe and generates steam which is output into a steam oven cavity 6 through a steam output pipe, the processed food in the steam oven cavity is steamed, the water in the water tank is continuously pumped by the water pump in the using process, the water level in the water tank continuously drops, firstly, the initial rough detection of the water amount is carried out through a reed pipe liquid level meter, a reed pipe in the reed pipe liquid level meter is also called a magnetron as a switching element controlled by a magnetic field signal, when no magnetism exists, the circuit is disconnected, and the state of mechanical motion or the circuit can be detected. When the magnetic switch is not in working state, the two reeds in the glass tube are not contacted. If a magnetic substance is close to the glass tube, the two reeds are magnetized and mutually attracted together under the action of the magnetic field, so that the circuit is closed. When the magnetic substance disappears, the two reeds are separated due to the elasticity of the reeds without the influence of external magnetic force, and the circuit is disconnected. When detecting that water is full, the reed pipe liquid level meter is disconnected, MCU's level is the high level, otherwise detect the lack of water, this moment is the lack of water state, and true anhydrous state is not, can carry out rough detection to the water yield through the reed pipe liquid level meter, when it detects the water tank lack of water, actually there is certain water yield in the water tank, and these water yields can also maintain the steam oven and move one end time, and the following content detailed description carries out more accurate detection of liquid level to the remaining water yield through scientific calculation method.

The volume of the water inlet pipe is Vi, the volume of the water outlet pipe is Vo, the water flow of the water pump per second is Q, the length of the water tank is l, the width of the water tank is w, and the height of the water tank is h, so that the volume Vs of the water tank is l x w x h; according to the formula, the theoretical time T of the water pump for pumping the whole water tank is Vs/Q. The total time T used by the water pump for completely pumping water in the water tank can be calculated in the calculation process, and the total operation time of the water pump from the full water state of the water tank to the water-free state does not exceed the total time T.

In this embodiment, a more accurate detection method after the reed switch liquid level meter detects a water shortage state is described in detail with reference to fig. 1, first, in a state where the water amount is sufficient, after the steam oven is started to work, a steam mode is started, the water pump continuously works, the real-time temperature Temp of the evaporator is monitored, a set temperature Targ and a temperature difference Tx for temperature comparison are additionally set, if Temp > (Targ-Tx), a user is reminded that the water path is abnormal, otherwise, the water path is proved to be in a normal state, and the next step can be performed. The relation between the real-time temperature Temp of the evaporator and the set temperature Targ is monitored in real time, the condition of the water path can be judged according to the relation between Temp and (Targ-Tx), whether the water path is abnormal or not is found in time, a user is reminded, and damage to the steaming oven caused by the fact that the steaming oven is used in a water shortage state is avoided.

In this embodiment, the method for detecting the water level includes step S1: and detecting the water level of the water tank in real time, and entering the next step if a water shortage state occurs.

In this embodiment, with the continuous operation of the steam oven, when the water level drops to a certain degree, the reed pipe level gauge first monitors water shortage, and needs to enter the next accurate water level detection after water shortage, at this time, a water amount with a volume of V1 still remains in the water tank, and the theoretical calculation obtains that time T1 is V1/Q, so the water tank can be drained by the water pump with time T1. The value of V1 can not be very accurate, but can be calculated by taking values for many times under the normal detection condition of the reed pipe liquid level meter to obtain an average value, the time T1 is obtained by calculation, the running time of the water pump can not exceed the time T1 under the water shortage condition, the running time is used for limiting and protecting the accurate water level detection and calculation time, and when the evaporator temperature Temp is greater than the set temperature Targ in the second step, the running time is used as a reference for calculating the working time T for starting the water pump.

In this embodiment, the method for detecting the water level includes step S2: and monitoring and comparing the evaporator temperature Temp with the set temperature Targ in real time, and entering the next step if the evaporator temperature Temp is greater than the set temperature Targ. If the evaporator temperature Temp is higher than the set temperature Targ, it indicates that there is no water in the water tank, and at this time, the evaporator temperature Temp and the set temperature Targ need to be compared quickly and repeatedly, so as to achieve the purpose of preventing the evaporator from being damaged due to ultrahigh temperature under the condition of no water.

In this embodiment, the method for detecting the water level includes step S3: and continuously monitoring and comparing the relation between the evaporator temperature Temp and the set temperature Targ after the water pump works for a designated time in real time, repeating the step S2 if the evaporator temperature Temp is reduced, alarming that the water tank is not filled with water if the evaporator temperature Temp is not reduced, and repeating the step S1 after the water tank is filled with water.

In the embodiment, when the water tank is in a water shortage state, a detection calculation process is started, the evaporator is started first, the evaporator temperature Temp is monitored continuously in real time, when the evaporator temperature Temp is greater than a set temperature Targ, the working time T (T < < T1) of a water pump is set to be started through calculation, if the temperature Temp < (Targ-Tx) of the evaporator is reduced to be lower than the set temperature at the moment, water is in the water tank, the detection process is continued, the circulation is repeated, the number of times of starting the water pump in the process that the water tank is in water shortage and water is pumped out is N until V1< < N x T Q, the water tank is judged to be in water shortage, the oven reminds a user that the water tank is in no water, meanwhile, if the temperature of the evaporator Temp (Targ-Tx) occurs in the detection process, the water tank is in the same way, the user needs to add water, the state is recorded, the detection is continued, if the water pump continuously works and the temperature of the evaporator still keeps Temp > (Targ-Tx), the user is reminded that the water path is abnormal, and the water path needs to be overhauled at the moment. The process comprises detection of two conditions, wherein one condition is that the temperature of the evaporator is too high due to no water in the water tank, the other condition is that the temperature of the evaporator is too high due to the fact that the water pump is abnormal in a water path, the water pump cannot normally convey water to the evaporator and cannot normally cool the evaporator due to the fact that the water path is abnormal, the evaporator temperature which is caused by the two conditions is distinguished and judged through strict logic analysis and calculation, specific conditions which occur at present are reminded to a user, correct alarm is carried out, the user can know the actual use condition of the device in time, two anhydrous alarm calculation methods are provided, the alarm is more accurate, and the safe use of the device is further ensured.

In step S2 of this embodiment, after the water pump operates for time T (T < < T1), the evaporator temperature Temp is continuously compared with the set temperature Targ by waiting for the time Td, and after the time Td, the evaporator temperature Temp > (Targ-Tx) is waited for, and similarly, the water tank is alarmed to be empty, because the above process takes into account that the evaporator temperature cannot be immediately lowered, the evaporator needs to be cooled again after the water pump operates for time T, and the evaporator temperature Temp can be monitored more accurately after reasonable cooling time is given, so that the calculation accuracy of the method can be effectively improved; as the number of water pump runs increases, the Td time is gradually decreased, which is to prevent the false alarm temperature sensor from being abnormally opened due to the rapid rise of the temperature in the evaporator during the waiting time Td.

In this embodiment, when the steam oven is used for a long time, the water pump needs to be adjusted at any time for the value of the water flow Q per second when the water pump works every second, the reed switch of the water tank detects that water is short to no-water alarm, the number of times of alarm is recorded from the first time when the user is reminded to add water is N, Q1 is V1/(N t) from the first time of no-water alarm to the nth time of no-water alarm, Qn is V1/(N t), Q1 to Qn are recorded, Q1, Q2, Qn are sorted according to the magnitude of the value, the average value is taken as the water flow Q per second used in the calculation in the current detection process after the maximum value and the minimum value are removed, the method is a high-precision water level detection method, the accurate water flow Q per second of the current water pump is needed for the calculation process, and the automatic calculation value calculation of the water flow Q per second suitable for the current detection process can be performed for each detection process through the above process, the method avoids the influence on the precision of accurate water level detection calculation caused by the fact that the water flow Q per second of the water pump working per second changes along with the increase of the service time, thereby avoiding that each data participating in the calculation process can not adapt to the current calculation process, ensuring that the data participating in the calculation is matched with the service time limit and normal loss of the device, and improving the precision of the detection process.

In summary, the detection method has the advantages that: the reliability is high by adopting an intelligent control method; the system has the advantages that the system has the functions of preliminary rough detection of the water level and accurate water level detection in a small water quantity state in seamless connection and matching with the preliminary detection, and high-precision detection is realized; each link cooperation that detects at the water level sets up the unusual detection function in water route, and whether the warning water tank that can be accurate lacks water and the water route is unusual, and the function is various, guarantees the long-term safe handling of device.

In the description of the present application, it is to be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.